Apparatus for casting chill rolls and the like



July 23. 1929 w. H. NICHOLS APPARATUS FOR CASTING CHILL ROLLS AND THE LIKE Filed Dec. 1'7, 1928 2 Sheets-Sheet l y 23, 1 w. H. NICHOLS 1,721,969

APPARATUS FOR CASTING CHILL ROLLS AND'THE LIKE Filed 1380.17, 1928- 2 Sheets-Sheet 2 7 roll WILLIAM H. NICHOLS, 0F WILKINSBURG, PENNSYLVANIA.

PARAT'US FOR CASTING CHTLL ROLLS AND THE LI.

Application filed December 17, 1923. Serial No. 326,586.

My invention is an improvement in the art of chill roll castings or the like. It has in view to provide an improved means for simplifying and improving the manufacture and the product of chill castings of any kind capable of being made, following my invention, and especially in the art of making chilled Ordinarily, in the manufacture of chill rolls or other cylindrical bodies, the face of v the roll is cast against a solid metal ring of steel or iron of suflicient sectional depth to ensure quick extraction of the heat of the metal being formed.

In the common practice of casting chill rolls it is diificult to control the uniform depth of the chill evenly all around, With uniformity of diameter. Also to avoid fire cracking of the solid chill, while the formation of pin holes and other defects due to confined gases, tends to imperfection of surface. a

In my improvement, I provide a sectional chill composed of a series of annular wall members within an outer confining case or flask, with ventilation spaces, bearing portions, and other features.

The invention provides for the placement or location at any desired position, of an annular series of segmental sections, with ample facility for escape of hot gases or air and rapid heat extraction from the casting.

The invention is adaptable to plane cylindrical surfaces, or to angular depressions at any portion of the mold cavity, for local chilling at any portion or portions, as hereinafter described.

In the drawings showing one preferred embodiment of the invention adapted to utilize the invention:

Fig. l is a plan view of a chill mold for casting chill rolls according to my invention;

Fig. 2 is a vertical section on the line 1I1l of Fig. 1;

Fig. 3 is a perspective detail view of one of the filler blocks or sections, detached;

Fig. 4 is a partial sectional view, like Fig. 2, showing application of the invention to corner recesses of the mold, for local chilling;

Fig. 5 is a partial cross section on the line V-V of Fig. 4:;

Fig. 6 is a view like Fig. 3, showing one of the segments detached as used in corner chilling;

Fig. 7 is a partial sectional view showing the application of the invention for application of a chill to the groove portion of the body of a roll. j

in the drawings, 2 is the outer flask or casmg surrounding the main middle casting cavity of theroll or other article to be made. It is adapted to interfit and connect above and below with any suitable supplemental neck molding flask extensions, for ordinary sand molding of the roll necks, or for additional chill molding sections, as desired.

The flask 2 is of any suitable construction, but for roll casting it is cylindrical, having an interior smooth annular surface 3, preferably turned for true engagement with the abutting ends of the several inner sections a.

The annular wall 2 of the flask is provided with a plurality of gas release ports 4 suit.- ably arraiiged as shown, and the lower inner wall is preferably provided with an inwardly extending annular shoulder 5 for supporting the sections in place.

Sections a are of segmental shape, for the full or part depth only of the main vertical casting cavity, as when two or more vertical series are employed, with the remaining wall of sand.

Each segmental section a is provided with radially arranged meeting faces 6, 7, at its inner and outer portions for making contact with similar faces of adjacent sections all around the entire annular series.

The inner meeting faces 6 are continuous from top to bottom, thereby forming a substantially continuous inner cylindrical surface when'assembled, while the rear faces 7 are interrupted by alternating channels 8. These communicate with main channels or depressions 9 extending from top to bottom, between the continuous extended inner meeting faces 6 and the alternating or separated outer faces 7. The outer or wider end of each section a is also preferably provided with a vertical groove or gutter 10 from top to bottom as shown, the several grooves and depressed portions throughout the series operating to provide numerous channels for leakage throughout.

continuously smooth. When two or more series are utilized, the 'oints ma beofi-set or broken as in Fig. 2, but in either case there is ample and frequent opportunityfor gas The chill sections as thus arranged are sufliciently flexible as a whole under the changing heat conditions to provide for any possible expansion and contraction without,

danger of fracture, while ensuring symmetry and regularity of body texture of the casting.

Obviously the segmental sections a first become heated to a higher temperature than the surrounding shell 2, and will expand inwardly towards the roll center, being retained by the cooler outer shell, which becomes heated later. In this manner the ,roll

surface is closely confined and the edge joints sulting in greater uniformity of surface regu larity. The uniformity. of body diameter and of depth of chill, is also more evenly maintained. i

The outer flask being a permanent portion of the equipment, any one or more of the sections (2!. may be replaced if worn or broken, at a minimum of cost. Due to the free radiation of heat, I have found that a large percentage of fire cracking common in the old form of solid chill flasks is obviated. The operation of castingchill rolls or the like is not only greatly improved both in method and product, with a shortening in time, but the cost of manufacture is materially reduced.

The side contactin faces 6, 7, being on common planes provi e for easy planing and finishing, the several faces projecting beyond the recessed circulation clearance spaces in the manner of chipping strips.

When it is desired to chill only certain portions or zones of the roll being cast, as the grooves or asses of shaping rolls, the segments may e formed with imier conforming chill sections ada ted to surround the portion to be controlled? Thus in Fig. 4 I show one side of a roll mold for casting a roll in which a rail groove 6 is to be turned. In such case the segment a is off-set as at 11, providing theinner projecting portion 12 partly or entirely form ing the chill surface for the necessary area of the roll in which the groove is to be turned.

In such form of segment the circulation depression 9 extends inwardly by an angular pocket 13 towards the neck of the roll, the shouldered form of the segments presenting greatly increased contacting surfaces for 1a id heat extraction.

*ig. 4 also illustrates the manner in which portions of the mold may be made up of an nular sections of ordinary molding sand 14 between spaced apart chill sections and with in continuous sections of shells. Such arrangement may be utilized when a portion or portions of the roll are of ordinary sand castmg, without chill, as for the molding of a roughing roll groove, etc.

On the other hand any intermediate portion of the roll may be chilled between ordinary sand cast sections, by the use of an intermediate series of segments a as in Fig. 7

The segments in such case are generally 'thesame as above described, and may be deflected inwardly for chill groove formation as at 15, the side channels being also deflected inwardlyas at 13.

What I claim is: 1. A chill roll casting mold comprising an outer cylindrical metal shell provided with ventilating ports and an annularseries of segmental chill sections therein having inner contacting faces and sides with intervening clearance depressions in the sides providing circulation spaces.

2. A chill roll casting mold comprising an outer cylindrical metal shell provided with ventilating ports and an annular series of segmental chill sections therein having inner contacting faces and sides with intervening clearance depressions in the sides providing circulation spaces and communicating de pressions leading to the outer shell.

3. A chill roll casting mold comprising an outer cylindrical metal shell provided with ventilating ports and an annular series of segmental chill sections therein having inner contacting faces and sides with intervening clearance depressions in the sides providing circulation spaces and having circulation channels along their outer shell engaging edges.

4. In combination, an outer annular metal shell having series of circulation ports therethrough and an inner series of segmental chill sections in close contacting engagement with each other along their inner slde edges and having outer similar contacting side. edge abutments interrupted by circulation channels.

5. In combination, an outer annular metal shell having series of circulation orts therethrough and an inner series 0 segmental chill sections in close contacting engagement shell having series of circulation ports therethrough and an inner annular shoulder, and an inner series of segmental chill sections in close contacting engagement with each other along their inner side edges and provided with circulation depressions, and having an annular off-set shoulder engaging the inner shoulder of the shell.

7. A segmental shaped metal chill section for a chill roll mold having a continuous contact face along each inner side, a depressed middle side face, and contact faces along its outer side faces interrupted by circulation channels communicating with the side face depressions.

8. A segmental shaped metal chill section for a chill roll mold having a continuous contact face along each inner side, a depressed middle side face, and contact faces along its. outer side faces interrupted by circulation channels communicating with the side face depressions, and provided with a vertical circulation channel along its rear shell contacting face.

9. A segmental shaped metal chill section for a chill roll mold having an inwardly deflected angular molding face and a correspondingly deflected continuous contact face along each inner side, a depressed middle side face inwardly deflected between said, contact faces, and contact faces along its outer side faces interrupted by circulation channels communicating with the side face depressions.

10. A'segmental shaped metal chill section for a chill roll mold having an inwardly deflected angular molding face and a correspondingly deflected continuous contact face along each inner side, a depressed middle side face inwardly deflected between said contact faces, and contact faces along its outer side faces interrupted by circulation channels communicating with the side face depressions, and provided with a vertical circulaiion channel along its rear shell contacting ace.

11. A segment-a1 shaped metal chill section for a chill roll mold having an inwardly deflected angular molding face and a correspondingl deflected continuous contact face along eac inner side, a depressed middle side face inwardly deflected between said contact faces, and contact faces along its outer side faces interrupted b circulation channels communicating with t e side face depressions, and provided with a vertical circulation channel along its rear shell contacting face and an off-set supporting shoulder.

In testimony whereof I hereunto aflix my signature.

WILLIAM H. NICHOLS. 

